Electrochemical studies of copper and lead complexation by fulvic acid. I. Potentiometric measurements and a critical comparison of metal binding models

摘要: Abstract Copper and lead ion-selective electrodes have been used to monitor titrations of Pb Cu with fulvic acid extracted from the River Tamar, Southwest England. The were carried out in 0.1 M NaClO4 at 25°C pH values range 6.0 6.5. titration data analysed using five different models; two assuming small discrete binding sites (multi-site multidendate models), three continua (electrostatic, normal distribution affinity spectrum models). On both statistical practical grounds multi-site model was identified as most effective modelling data. A synthetic set proposed by Fish Morel (1984) examine effect random errors on various analysis procedures.